Core teaching deck for TKPJava Designed to be used with lessons from www.TeachingKidsProgramming.org

1. TKPJava Language Notes
@LynnLangit

2. TKPJava Language Concepts
• Getters/Setters
• For Loops
• Methods
• Exceptions
• Variables
Course 1, 2
• If, If/Else
Course 3, 4
• HashMaps
• Lists, Arrays
Course 5
• Model-View-Controller
• String Concatenation
Course 6
• Object instances
• Special Methods
• Main
• Constructor
Course 7
• Foreach Loops
• ArrayLists
• Events
Course 8
• Do/While Loops
• Unit Tests / TDD
Course 9
• List
Keywords

3. COURSE 1

4. To view a Value -- Getters
GetPenColor ( );
GetPenWidth ( );
GetSpeed ( );

5. To Change a Value -- Setters
SetPenColor (PenColors.Reds.Red);
SetPenWidth (5);
SetX (10);

6. For Loops
for (int i = 0; i < stop; i++) {
//Do something many times
}

7. Try Catch Finally
try
{ //Do something }
catch (Exception e)
{ //Handle exception }
finally
{ //Always do this }

8. COURSE 2

9. Methods are like Verbs
public static void sayIt (String s) {
//Say something
}

10. Use a Method
String greeting = “hello”;
//Say hello
sayIt (greeting);

11. Create and Assign Variables
//the current zipcode is 90210
String zipcode = “90210”;

12. Increment Variables
int age = 15;
age += 1; //Shortcut
age = age + 1;

13. Increment Variables again…
int age = 16;
age ++; //Another shortcut

14. COURSE 3

15. Conditionals - If
int test = -1;
if (test < 0) {
//Do something
}

16. Conditionals – If / Else
int test = 75;
if (test => 90)
{ //Do something }
else if (test => 80)
{ //Do something else }
else
{ //Do something else }

17. COURSE 5

18. HashMaps
HashMap<Integer, Color> c =
new HashMap <Integer, Color> ( );
c.put(1,Colors.Reds.Red);
c.get(1);

19. Arrays
String words[ ] =
new String[ ] {“hi”,”Java”};
words.get[1]; //Gets “Java”

20. More Arrays
//Simpler set up – fixed length
int [ ] coins = {1,5,10,25,50};

21. COURSE 6

22. String Concatenation
String story = “This is my story”;
//Add to your story
story += “. I am ” + 15 + “ years old”;

23. RegEx – Regular Expressions
String adverb = “2”;
if (adverb.matches(“[d]*”)) {
//Checks for pattern match
}

24. Model-View-Controller
//Model
String story = “This is my story”;
//View and Controller
MessageBox.showMessage(story);

25. COURSE 7

26. Objects and Instances - 1

27. Objects and Instances
Turtle turtle1 = new Turtle( );
Turtle turtle2 = new Turtle( );
turtle1.setX(20);
turtle2.setX(50);

28. Main Method starts it all
public static void main (String[ ] args) {
//Start by doing something
}

29. Constructor (Method)
public class Animal( ) {
public Animal( ) {
//Create your Animals here
}
}

30. Foreach Loops
for (Turtle turtle : turtles) {
//Do something to each one
}

31. ArrayList
ArrayList<String> words=
new ArrayList<String>( );
words.add(“Java”); //Adds “Java”
//Adjustable length list

32. Objects and Instances - 2

33. ArrayList…again
ArrayList<Turtle> turtleBag =
new ArrayList<Turtle>( );
Turtle t1 = new Turtle( );
turtleBag.add(t1);

34. COURSE 8

35. Events and Listeners
public class DoIt
implements MouseLeftClickListener {
…
programWindow.addMouseLeftClickListener (this);
public void onLeftMouseClick(int x, int y) {
//Do something when clicked
}
}

36. COURSE 9

37. While Loops
while (x < 20) {
//Do something when true
}

38. Do…While Loops
do {
//Do something at least once
//Continue to do it while true
}
while (x < 20)

39. Unit Tests
@Test
public void testReturnsFizz( ) {
String result = FizzBuzz.convert(3);
//Verify expected vs. actual
assertEquals(“fizz”, result);
}

40. ADDITIONAL MATERIAL

41. Java Keywords 1
Scope and Packages
• public
• private
• protected
• import
• package
Class and Methods
• abstract
• class
• new
• super
• static
• this

42. Java Keywords 2
Flow and Exceptions
• break
• do
• if
• else
• return
• while
• assert
• try, catch, finally
• throw, throws
Types
• boolean
• byte
• char, string
• enum
• int, double, float
• long, short

43. Java RegexMeta Characters
RegEx More Info
d Any Digits 0-9
D Not digits 0-9
s Whitespace
S Any Character
w Any word
W Not word
b End of word
B Not end of word